Taken from RealAge.com

Squash and Leek LasagnaIf lasagna is just a layered noodle casserole, there's no reason to stand on ceremony. Here's a vegetarian, autumnal version with butternut squash, leeks, pine nuts and Parmigiano-Reggiano. 10 ounce(s) lasagna noodles, preferably whole-wheat2 tablespoon(s) unsalted butter4  large or 5 medium leeks, pale green and white parts only, thinly sliced 1/2 cup(s) all-purpose flour4 cup(s) nonfat milk1 teaspoon(s) dried thyme1 teaspoon(s) salt 3/4 teaspoon(s) freshly grated nutmeg 1/2 teaspoon(s) freshly ground pepper1  2-pound butternut squash, ,peeled, halved, seeded and grated using the large-hole side of a box grater6 ounce(s) Parmigiano-Reggiano, grated using the large-hole side of a box grater 1/4 cup(s) toasted pine nuts Preheat oven to 350 degrees F. Coat a 9-by-13-inch baking dish with cooking spray. Bring a large pot of water to a boil. Cook noodles until not quite al dente, about 2 minutes less than the package directions. Drain; return the noodles to the pot and cover with cool water. Melt butter in a Dutch oven over medium heat. Add leeks; cook, stirring often, until softened, about 6 minutes. Sprinkle flour over the leeks; stir well. Cook, stirring constantly, for 2 minutes. Whisk in milk in a slow stream and cook, whisking constantly, until thick and bubbling, 8 to 10 minutes. Whisk in thyme, salt, nutmeg and pepper. Remove from the heat. Assemble lasagna in the prepared baking dish by layering one-third of the noodles, one-third of the sauce, half the squash, one-third of the cheese, half the remaining noodles, half the remaining sauce, all the pine nuts, all the remaining squash, half the remaining cheese, all the remaining noodles, all the remaining sauce and all the remaining cheese. Cover with parchment paper then foil. Bake the lasagna for 50 minutes. Uncover and bake until bubbling and lightly browned, 30 to 45 minutes more. Let stand for 10 minutes before serving (or follow make-ahead instructions).